Cesium
- Formula: Cs
- Molecular weight: 132.9054519
- IUPAC Standard InChIKey: TVFDJXOCXUVLDH-UHFFFAOYSA-N
- CAS Registry Number: 7440-46-2
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Caesium
- Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Options:
Data at NIST subscription sites:
NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.
Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | 76.5 ± 1.0 | kJ/mol | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
ΔfH°gas | 76.50 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1968 |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 175.601 ± 0.003 | J/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
S°gas,1 bar | 175.60 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1968 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | 947.967 to 1000. | 1000. to 4000. | 4000. to 6000. |
---|---|---|---|
A | 20.78603 | 34.45424 | -181.0408 |
B | -5.669112×10-8 | -13.79661 | 79.98971 |
C | 7.218238×10-8 | 4.132566 | -9.185764 |
D | -3.086880×10-8 | -0.137732 | 0.329954 |
E | -3.919589×10-10 | -3.950387 | 374.0571 |
F | 70.30292 | 58.22078 | 517.6152 |
G | 200.7542 | 210.5447 | 242.2787 |
H | 76.50026 | 76.50026 | 76.50026 |
Reference | Chase, 1998 | Chase, 1998 | Chase, 1998 |
Comment | Data last reviewed in June, 1968 | Data last reviewed in June, 1968 | Data last reviewed in June, 1968 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°liquid | 2.09 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1968 |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid,1 bar | 92.07 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1968 |
Quantity | Value | Units | Method | Reference | Comment |
S°solid,1 bar | 85.23 ± 0.40 | J/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
Quantity | Value | Units | Method | Reference | Comment |
S°solid | 85.15 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1968 |
Liquid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | 301.55 to 947.967 |
---|---|
A | 30.04635 |
B | 0.506293 |
C | 0.347554 |
D | -0.099462 |
E | 0.197109 |
F | -6.234160 |
G | 129.3768 |
H | 2.087001 |
Reference | Chase, 1998 |
Comment | Data last reviewed in June, 1968 |
Solid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | 298. to 301.55 |
---|---|
A | 57.04424 |
B | -50.00340 |
C | 48.55950 |
D | -16.72822 |
E | -1.223804 |
F | -19.28397 |
G | 160.2012 |
H | 0.000000 |
Reference | Chase, 1998 |
Comment | Data last reviewed in June, 1968 |
Phase change data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
552. to 963. | 3.69576 | 3453.122 | -26.829 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
Reaction thermochemistry data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: John E. Bartmess
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
(CAS Reg. No. 501951-35-5 • 4294967295) +
= CAS Reg. No. 501951-35-5
By formula: (CAS Reg. No. 501951-35-5 • 4294967295Cs) + Cs = CAS Reg. No. 501951-35-5
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 100. ± 4.2 | kJ/mol | Ther | Miller, Leopold, et al., 1986 | gas phase; Extrapolated by polarizability and radius from experimental data. |
By formula: (Br- • 4294967295Cs) + Cs = Br-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 124.7 ± 4.0 | kJ/mol | N/A | Miller, Leopold, et al., 1986 | gas phase; Extrapolated by polarizability and radius from experimental data. |
(CAS Reg. No. 131026-50-1 • 4294967295) +
= CAS Reg. No. 131026-50-1
By formula: (CAS Reg. No. 131026-50-1 • 4294967295Cs) + Cs = CAS Reg. No. 131026-50-1
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 44.7 ± 2.6 | kJ/mol | N/A | McHugh, Eaton, et al., 1989 | gas phase; Vertical Detachment Energy: 0.511±0.010 eV |
(CAS Reg. No. 106070-96-6 • 4294967295) +
= CAS Reg. No. 106070-96-6
By formula: (CAS Reg. No. 106070-96-6 • 4294967295Cs) + Cs = CAS Reg. No. 106070-96-6
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 133. ± 9.6 | kJ/mol | N/A | Miller, Leopold, et al., 1986 | gas phase |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Ion clustering data, NIST Free Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data evaluated as indicated in comments:
L - Sharon G. Lias
Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess
View reactions leading to Cs+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 3.89390 ± 0.000002 | eV | N/A | N/A | L |
Electron affinity determinations
EA (eV) | Method | Reference | Comment |
---|---|---|---|
0.471630 ± 0.000044 | N/A | Scheer, Tho/gersen, et al., 1998 | Given: 0.47164(6) eV; B |
0.471630 ± 0.000044 | LPD | Slater, Read, et al., 1978 | Given: 0.47160(25) eV; B |
0.4700 ± 0.0030 | LPES | Patterson, Hotop, et al., 1974 | B |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
3.89390 | EVAL | Lide, 1992 | LL |
3.9 | EI | Busse and Weil, 1982 | LBLHLM |
3.89 | PE | Williams and Potts, 1976 | LLK |
3.89 | EI | Nygaard and Hahn, 1974 | LLK |
3.89390 ± 0.000002 | S | Moore, 1970 | RDSH |
Ion clustering data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, NIST Free Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: John E. Bartmess
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.
Clustering reactions
By formula: (Br- • 4294967295Cs) + Cs = Br-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 124.7 ± 4.0 | kJ/mol | N/A | Miller, Leopold, et al., 1986 | gas phase; Extrapolated by polarizability and radius from experimental data. |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A.,
CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Stull, 1947
Stull, Daniel R.,
Vapor Pressure of Pure Substances. Organic and Inorganic Compounds,
Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022
. [all data]
Miller, Leopold, et al., 1986
Miller, T.M.; Leopold, D.G.; Murray, K.K.; Lineberger, W.C.,
Electron Affinities of the Alkali Halides and the Structure of their Negative Ions,
J. Chem. Phys., 1986, 85, 5, 2368, https://doi.org/10.1063/1.451091
. [all data]
McHugh, Eaton, et al., 1989
McHugh, K.M.; Eaton, J.G.; Lee, G.H.; Sarkas, H.W.; Kidder, L.H.; Snodgrass, J.T.; Manaa, M.R.; Bowen, K.H.,
Photoelectron Spectra of the alkali metal cluster Anions: Na-,n=2-5, K-,n=2-7, Rb-,n=2-3, and Cs-,n=2-3,
J. Chem. Phys., 1989, 91, 6, 3792, https://doi.org/10.1063/1.456861
. [all data]
Scheer, Tho/gersen, et al., 1998
Scheer, M.; Tho/gersen, J.; Bilodeau, R.C.; Brodie, C.A.; Haugen, H.K.,
Experimental Evidence that the 6s6p2Pj States of Cs- are Shape Resonances,
Phys. Rev. Lett., 1998, 80, 4, 684, https://doi.org/10.1103/PhysRevLett.80.684
. [all data]
Slater, Read, et al., 1978
Slater, J.; Read, F.H.; Novick, S.E.; Lineberger, W.C.,
Alkali Negative Ions. III. Multichannel Photodetachment of Cs- and K-,
Phys. Rev. A, 1978, 17, 1, 201, https://doi.org/10.1103/PhysRevA.17.201
. [all data]
Patterson, Hotop, et al., 1974
Patterson, T.A.; Hotop, H.; Kasdan, A.; Norcross, D.W.; Lineberger, W.C.,
Resonances in Alkali Negative-Ion Photodetachment and Electron Affinities of the Corresponding Neutrals,
Phys. Rev. Lett., 1974, 32, 5, 189, https://doi.org/10.1103/PhysRevLett.32.189
. [all data]
Lide, 1992
Lide, D.R. (Editor),
Ionization potentials of atoms and atomic ions
in Handbook of Chem. and Phys., 1992, 10-211. [all data]
Busse and Weil, 1982
Busse, B.; Weil, K.G.,
Mass spectrometric studies on the vapour phase composition over solid and fused Cs3Sb,
Ber. Bunsen-Ges. Phys. Chem., 1982, 86, 93. [all data]
Williams and Potts, 1976
Williams, T.A.; Potts, A.W.,
Complexities in the HeI photoelectron spectra of alkali metal vapours,
J. Electron Spectrosc. Relat. Phenom., 1976, 8, 331. [all data]
Nygaard and Hahn, 1974
Nygaard, K.J.; Hahn, Y.B.,
Ion fluorescene in cesium,
Physica, 1974, 75, 333. [all data]
Moore, 1970
Moore, C.E.,
Ionization potentials and ionization limits derived from the analyses of optical spectra,
Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.), 1970, 34, 1. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, References
- Symbols used in this document:
EA Electron affinity IE (evaluated) Recommended ionization energy S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid Entropy of solid at standard conditions S°solid,1 bar Entropy of solid at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.